Crossword clue: Capacitance unit, in electromagnetism

The answer to the crossword clue "Capacitance unit, in electromagnetism" is "farad." A farad is the standard unit used to measure capacitance, which is the ability of a component to store electrical charge. It is named after the scientist Michael Faraday, who made important contributions to electromagnetism. Therefore, "farad" perfectly fits the clue given.